Kosten van Coin Grading

Kosten van Coin Grading

What is a gold 10 gulden worth?

A gold 10 gulden is a Dutch gold coin whose value depends on gold content, dealer pricing, and rarity. Rare dates and high-quality examples can achieve significant auction results.

Collecting coins for beginners

Coin collecting for beginners starts with structure and understanding. This article explains what numismatics is, which types of coins you can collect, and how to build a focused collection step by step. From Dutch and foreign coins to Roman and Greek examples, with attention to quality, authenticity and historical context.

Numismatic premium lots

Discover the rarest coins and medals from the upper segment of Schulman auctions. From the 20 Guilder 1808 of Louis Napoleon to gold ducatons struck at ten-ducat weight: backgrounds, realised prices and what makes these premium lots so exceptional.

Coins Found with a Metal Detector: How to Determine Their Value and Sell Them Safely?

Coins found with a metal detector can range from common finds to historically significant and highly collectible pieces. This guide explains how to determine the value of metal-detected coins, what factors influence their worth, how to document and register finds correctly, and how to sell them safely.

Schulman's numismatics bibliography

Overview of abbreviations and standard works used by Schulman in auction catalogues and descriptions. Guide to correct citation and quick search.

What is patina?

Patina is the natural discolouration that forms when metal reacts with the atmosphere. Discover why collectors prize an authentic patina and how it affects the value of your coins.

What is a Piedfort?

A piedfort is a heavier variant of a coin, originally produced as a trial strike or presentation piece. Discover the origin, characteristics and rarity of piedforts and why collectors prize them so highly.

Why you should never clean or polish your coins

Many people believe cleaning old coins restores their shine. In reality, it is one of the biggest mistakes a collector can make. Polishing or cleaning coins damages the metal and can reduce collector value by 50 to 90%.

What is a silver rider?

Discover everything about the Silver Rider dukaton: origin, design, provinces, weight, silver content and historical significance. Complete knowledge article by Schulman.

How Do I Know What My Old Coins Are Worth?

Want to know what your old coins are worth? Learn how experts at Schulman b.v. determine value based on rarity, quality, metal content and historical significance.

The Kempen Hoard

Discover the Kempen Hoard, a rare find of gold and silver coins from the 15th to 17th centuries